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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a758682631f74f93b1f142b4e57bd72d5acd6477c4cdd8d96f545e24e1f4d3' 
  AND token = '44DqjoZQ5Sc3YOV1yRMfiEAs05JGWLidqvNrkV2X9LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}